There is no universal meaning to any of the symbolism used in a family crest. The meaning depends on where in the world the crest was designed, when, and by whom.
Sorry, but there is no such thing as a Family Coat of Arms.
It means Truth & Loyalty
in short it means your clan were great warriors
Family crest Bird's crest
The animal on the Heath family crest is a rooster. Google "heath family crest" to view one.
There is no uniformity of color meanings on family crests or other ancient symbolic devices. The meaning of such things, if any, depends on the place and time the crest was created, and also on the specific circumstances.
Google "Mondini Family crest" to view several websites that have images of the crest.
The Cullen's Crest is a family crest that was in the movies. It wasn't in the books.
Most families never had a family crest. For those few who did, when a woman married, she joined the family of her husband and that crest would apply.
A medieval family crest is a symbol or "coat of arms" that represents a certain family with knights in their ancestry. A knight may have carried this crest on his shield.
The Janssens family crest can be found at:http://www.zazzle.com/janssens_family_crest_postcard-239789447178229918